Pump with dual rotors



April 26, 1960 F. w. ROSENTRATER 2,934,260

PUMP WITH DUAL ROTORS Filed Oct. 16, 1957 92 Fig.5

Fred W Hosea/rater INVEN TOR.

United States Patent PUMP WITH DUAL ROTORS Fred W. Rosentrater, Chicago,ill.

Application October 16, 1957, Serial No. 690,515

1 Claim. (Cl. 230-141) This invention relates in general to new anduseful improvements in fluid, gases and air pumps and more particularlyto a pump used for these purposes having dual rotors.

The primary object of this invention is to provide a pump which includestwo internal rotors, the rotors being of such a design and so positionedwhereby they create a dual suction and repelling action in the samedirection simultaneously with a very minimum amount of resistance.

Another object of this invention is to provide a pump which issoconstructed whereby it will efliciently create either a high speed flowand/or a pressure action on fluids and gases of all types and also air.

Another object of this invention is to provide an improved pump which isso constructed whereby the inlet openings thereof are identical wherebythe direction of flow through the pump may be varied as is desired.

A further object of this invention is to provide an improved rotordesign which is of such a nature whereby a pump incorporating a pair ofsuch rotors disposed in meshed relation and driven in timed sequencewill produce a maximum pumping action either of a high speed flow natureor a pressure action with a minimum resist ance so as to have a maximumefliciency.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

Figure 1 is a vertical sectional view taken through the fluid pump whichis the subject of this invention, the view being taken between one ofthe cover plates of the hous ing of the pump and the body member thereofand shows both the internal cross section of the housing and therelationship of the rotors with respect thereto;

Figure 2 is an elevational view showing the end construction of thefluid pump;

Figure 3 is an enlarged sectional view taken substantially upon theplane indicated by the section line 33 of Figure 1 and shows theinternal details of the fluid P p;

Figure 4 is an enlarged fragmentary elevational view of the fluid pumpwith a gear case cover thereof removed in order to show the arrangementof driving gears therein; and

Figure 5 is an enlarged fragmentary view similar to Figure 4 and shows amodified form of drive.

Referring now to the drawings in detail, it will be seen that there isillustrated the dual rotor fluid pump which is the subject of thisinvention, the pump being referred to in general by the referencenumeral 10. The pump includes a housing which is referred to in generalby the reference numeral 12. The housing 12 is formed of a centralbodymember 14 and a pair of cover plates 16 and 18. The cover plates 16 and18 are secured to the body member 14 by means of suitable bolts 20. Itis to be noted that suitable gaskets 22 and 24 are disposed between thebody member 14 and the cover plates 16 and 18, respectively.

The housing 12 includes a longitudinal axis 26 and a transverse axis 28.The body member 14 is of a configuration whereby it is symmetrical aboutthe longitudinal axis and about the transverse axis. It is also to benoted from Figures 2 and 3 that the body member 14 is of a constantthickness. Disposed at opposite ends of the body member 14 along thelongitudinal axis 26 are openings 30 and 32. The openings 38} and 32 areidentical and may serve as either inlet or outlet openings. When one ofthe openings 30 and 32 is functioning as an inlet opening, the oppositeone of the openings 30 and 32 functions as an outlet opening.

The cover plate 16 has positioned therein a bearing 34 which is alignedwith a bearing 36 carried by the cover plate 18. and suitably journaledtherein is a first shaft 38.: The shaft 38 projects through thevcoverplate 16 and functions as a drive shaft. shown, will be connected to thedrive shaft 38.

The cover plate 16 is provided with a boss 40 in which there is mounteda bearing 42. Carried by the cover plate 18 in alignment with thebearing 42 is a bearing 44. Suitably journaled in the bearings 42 and 44and extending through the bearing 44 is a second shaft 46. The shafts 38and 46 are spaced along the transverse axis 28 and are spacedequidistant on opposite sides of the longitudinal axis 26.

Carried by the shaft 38 and keyed thereto by means of a key 48 is a hub56 of a rotor 52. Extending outwardly from the hub 5b, which is of asmall diameter, is a plurality of radiating blades 54. The blades 54 areof a flat configuration and are rectangular in outline. It is to benoted that the blades 54 are of a constant cross section.

Keyed to the shaft 46 by means of a key 56 for rotation therewith is asmall diameter hub 58 of a second rotor 60. The rotor 66, like the rotor52, includes a plurality of blades 62 which radiate from the hub 58. Theblades 62 are flat and rectangular in outline. It is to be noted thatthe blades 62 are of a constant cross section. From the foregoingdescription of the rotors 60 and 52, it will be readily apparent thatthe rotors are identical. It is also to be noted that the blades of therotors 52 and 60 closely engage portions of the housing 12 to assure aproper seal therewith. Also, the blades 54 and 62 intermesh and aredisposed closely adjacent the hubs 53 and 56, respectively, during theirrotation to further provide a suitable seal.

In order that the rotor 66 may be driven in an opposite direction and intimed sequence with the rotor 52, the cover plate 18 has extendingrearwardly therefrom a pair of idler shafts 64 and 66. The idler shafts64 and 66 are disposed in spaced relation along the transverse axis 28and are intermediate the shafts 38 and 46. Keyed on the shaft 38 is agear 68 which is meshed with a gear 70 which is freely rotatably mountedon the idler shaft 64. The gear 70 is meshed with a gear 72 which isfreely journaled on the idler shaft 66. The gear 72 is in turn meshedwith a gear 74 which is keyed to the shaft 46.

It is to be noted that the cover plate 18 includes a gear case 76 inwhich the gears 68, 70, 72 and 74 are positioned. The gear case 76 has aremovable cover plate 78 which is retained in place by bolts 80.

Referring now to Figure 5 in particular, it will be seen that there isillustrated a modified form of cover plate 82 which replaces the coverplate 18. The cover plate 82 differs from the cover plate 18 primarilyin that the idle shafts 64 and 66 are omitted. Keyed on the Extendingthrough the bearings 34 and 36 A suitable power source, not

shaft 38 is a pulley '84. A similar pulley 86 is keyed on the shaft 46.Entrained over the pulleys 84 and 86 is a driven belt 88 which has acentral portion thereof crossed as at 90 whereby the shafts 38 and 46are driven in opposite directions at the same rate.

The pulleys 84 and 86 and the drive belt 88 are disposed within a case92 formed integral with the cover plate .82. The case 92 is providedwith a removable cover (not shown) which is held in place by a pluralityof bolts 94.

The foregoing is considered as illustrative only of the principles ofthe invention. Further, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the .exact construction and operation shown anddescribed, and accordingly all suitable modifications and equivalentsmay be resorted to, falling Within the scope of the invention asclaimed.

What is claimed as new is as follows:

A pump comprosing a hollow housing, said housing including a centralbody member and spaced cover plates, said housing having a longitudinalaxis and a transverse axis, identical inlet and outlet openings in saidbody member, said inlet and outlet openings being in alignment alongsaid longitudinal axis, a pair of shafts disposed in spaced relationalong said transverse axis and equally spaced on opposite sides of saidlongitudinal axis, bearing means carried by said cover platesjournalling said shafts for rotation, a rotor carried by each of saidshafts for rotation with said shafts, said rotors being disposed inmeshing relation, drive means connected to a first of said shafts forrotating said shaft, connecting means connecting said first shaft to asecond of said pair of shafts for rotating said shafts in oppositedirections and in timed relation, said connecting means including a pairof idler shafts disposed along said transverse axis on one of said coverplates intermediate said first mentioned shafts, meshing drive gears onall of said shafts.

References Cited in the file of this patent UNITED SIA'IES PATENTS GreatBritain of 1891

